implement special trusted upload to be used with curl

example of use:

curl -F 'upload=@foo.png' -F 'daykeep=1' -F 'owner=foo@univ.fr' https://filex.univ.fr/filex/trusted-upload

you need to add in apache conf:

<Location /filex/trusted-upload>
  Order allow,deny
  Allow from xxx
  SetHandler perl-script
  PerlResponseHandler FILEX::Apache::Handler::Upload
</Location>